WO1988003933A1 - Dispersion polymere aqueuse destinee a etre utilisee comme couche d'appret sous une couche transparente a base de solvant pour vehicules automobiles - Google Patents

Dispersion polymere aqueuse destinee a etre utilisee comme couche d'appret sous une couche transparente a base de solvant pour vehicules automobiles Download PDF

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Publication number
WO1988003933A1
WO1988003933A1 PCT/US1987/002959 US8702959W WO8803933A1 WO 1988003933 A1 WO1988003933 A1 WO 1988003933A1 US 8702959 W US8702959 W US 8702959W WO 8803933 A1 WO8803933 A1 WO 8803933A1
Authority
WO
WIPO (PCT)
Prior art keywords
dispersion
particles
basecoat
clear coat
monomer
Prior art date
Application number
PCT/US1987/002959
Other languages
English (en)
Inventor
Armand Aerts
Peter Simmendinger
Original Assignee
E.I. Du Pont De Nemours And Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to KR1019880700876A priority Critical patent/KR890700144A/ko
Publication of WO1988003933A1 publication Critical patent/WO1988003933A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • B05D7/532—Base coat plus clear coat type the two layers being cured or baked together, i.e. wet on wet
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F246/00—Copolymers in which the nature of only the monomers in minority is defined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2451/00—Type of carrier, type of coating (Multilayers)

Definitions

  • the present invention involves aqueous acrylic polymer dispersions. More particularly, it involves such dispersions useful in making pigmented aqueous basecoats to be overlaid by solvent-based clear coats.
  • Waterborne polymer dispersions are widely used in paint formulations.
  • the usage in automotive paint systems involving a pigmented basecoat overlaid by a clear coat (known as color coat/clear coat or cc/cc) requires certain properties of the dispersion copolymer as well as from the paint formulation.
  • cc/cc it is necessary that the basecoat resists the attack of the solvents of the clear.
  • the present invention provides an aqueous dispersion of acrylic polymer particles which are not internally crosslinked but which contain functionality that can be crosslinked upon curing a coating made from such dispersion, said particles being made by emulsion polymerization starting with all ingredients as monomers, including, based on the total weight of polymerizable monomers,
  • the present invention is thought to solve the interpenetration problem by providing an aqueous polymer dispersion for the basecoat which has high polarity on the outside of the particles and low polarity inside, along with a reactible emulsifier polymerized into the particles.
  • the high polarity on the outside such as from acrylonitrile polymrerized into the particles, repels the solvent-based clear coat formulation sufficiently to minimize interpenetration.
  • the particle structure is disrupted and the lower polarity monomers on the inside of particles mingle with the other ingredients of the coating system, leading to good adhesion.
  • solvent resistant copolymer components are preferably polar because polar monomers will, during the course of the emulsion polymerization, concentrate at the particle surface. Hence, they will prevent the non-polar parts inside the particle from being dissolved by the solvents of the clear.
  • a copolymer component such as hydroxypropylmethacrylate is desirable to contribute a functional group which is crosslinkable with an amino resin upon curing to give a thermosetting coating.
  • Emulsion polymerization usually requires surfactants which are chosen according to the polymer composition to give the desired stability. Useful for the polymer composition mentioned below are ammonium salts of nonylphenyl (ethylene oxide) sulfate.
  • surfactants which have a pendent vinyl group and may be covalently bound to the polymer particle.
  • a combination of an ionic and nonionic dispersant may be used to increase the stability against gross flocculation.
  • the initiators used should be water-soluble.
  • a water-soluble radical-forming initiator such as ammonium peroxdisulfate is used.
  • monomer soluble initiators would give preponderantly a polymerization of the monomer droplets and thus a different particle size and particle size distribution.
  • Initiator and surfactant types and concentrations and polarity and water-solubility of the monomers govern the particle size and particle size distribution of the aqueous polymer dispersion.
  • Shearthinning of the aqueous polymer dispersion of the invention can be increased by adding a thermodynamically good solvent for the polymer such as dialkyl phthalate. Also increasing the viscosity of the continuous phase by means of a water-soluble polymer results in markedly higher shearthinning.
  • the basecoats prepared from these aqueous dispersions still contain an amino resin to crosslink the particles.
  • a coalescing agent such as butyl cellosolve is desirable.
  • the aluminum pigment used in the basecoat is stabilized by means of a carboxyl-containing acrylic resin and is protected from water attack by an organophosphate.
  • EXAMPLE 1 Aqueous Dispersion The following dispersion was prepared in a reaction vessel fitted with stirrer, thermometer, reflux condenser and means for controlled introduction of an initiator solution and a monomer mix. To a 5 l reactor was charged: (i) 1900 g demineralized water there was added a mixture of
  • reactible emulsifier (ii) 2 g methylmethacrylate 4 g reactible emulsifier.
  • the reactible emulsifier used is a neutralized surfactant of 30% solids in water of the half ester of maleic anhydride on nonyl phenol (ethylene oxide) n sulfonic acidf witn n about 6, made as follows:
  • Polystep RA 90 (Stepan Chemical Co., Northfield, IL, U.S.A.)
  • premixes were prepared: (i) 20 g methylmethacrylate-acrylic acid copolymer with about equal parts of each, lightly crosslinked (Acrysol ASE60) from Union Carbide were neutralized by a 25% solution of dimethylaminoethanol to pH 7.65 and demineralized water added up to 192 g. (ii) To 218 g aqueous polymer dispersion as described in (A) above were added 150 g demineralized water and adjusted to pH 7.65 by adding a 25% solution of dimethylaminoethanol.
  • Premix (i) was slowly added to premix (ii) and stirred for 1 hour.
  • the basecoat was adjusted to spray viscosity (viscosities were measured with Haake Rotovisco RV 100, MK 500, MVI) by adding demineralized water.
  • a shearfactor of 20 [n (1.17 sec -1 )/n (1170 sec -1 )] gives a sufficient spray latitude.
  • a metal panel was prepared with primer, then the basecoat was applied at 25% spray solids in two coats at 75% relative humidity at 23°C. After a flash period of 25 minutes, a commercial solvent-borne clear- coat was applied. The panel heated for 1 hour at 130°C. The coating thus obtained showed desirable properties.
  • Latex 2 q wt % mol mol %
  • Latex 3 q wt % mol mol %
  • Viscosity will increase. Test pH 7.5 - 7.9
  • Viscosity at 25% solids at high sheer rates (1170 sec -1 ) - 100-160 cP at low sheer rates (1.17 sec -1 ) - 9000-10000 cP
  • Viscosity at 20% spray solids at (1170 sec -1 ) - 80-100 cP at (1.17 sec -1 ) - 4000-5000 cP

Abstract

Dispersion acrylique aqueuse présentant une plus grande polarité à l'extérieur des particules qu'à l'intérieur, utilisée en tant que couche d'apprêt sous une couche transparente à base de solvant pour véhicules automobiles.
PCT/US1987/002959 1986-11-24 1987-11-17 Dispersion polymere aqueuse destinee a etre utilisee comme couche d'appret sous une couche transparente a base de solvant pour vehicules automobiles WO1988003933A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019880700876A KR890700144A (ko) 1986-11-24 1987-11-17 용매투명 도막밑의 자동차 하도에 사용하기위한 수성 중합체 분산액

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93425586A 1986-11-24 1986-11-24
US934,255 1986-11-24

Publications (1)

Publication Number Publication Date
WO1988003933A1 true WO1988003933A1 (fr) 1988-06-02

Family

ID=25465245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/002959 WO1988003933A1 (fr) 1986-11-24 1987-11-17 Dispersion polymere aqueuse destinee a etre utilisee comme couche d'appret sous une couche transparente a base de solvant pour vehicules automobiles

Country Status (7)

Country Link
EP (1) EP0269059A3 (fr)
JP (1) JPH01501485A (fr)
KR (1) KR890700144A (fr)
AU (1) AU8322387A (fr)
BR (1) BR8707541A (fr)
WO (1) WO1988003933A1 (fr)
ZA (1) ZA878802B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU609710B2 (en) * 1985-09-23 1991-05-09 Dow Chemical Company, The Thermoset acrylic coatings having improved gloss retention
US5071904A (en) * 1989-05-30 1991-12-10 Ppg Industries, Inc. Waterborne coating compositions for automotive applications
US5185397A (en) * 1989-08-21 1993-02-09 Rohm And Haas Company Water-based varnishes
US5100735A (en) * 1990-07-25 1992-03-31 E. I. Du Pont De Nemours And Company Waterborne basecoat/high solids clear finish for automotive substrates having an improved appearance
US5830928A (en) * 1996-02-20 1998-11-03 Ppg Industries, Inc. Waterborne coating compositions
JPH1046099A (ja) * 1996-07-31 1998-02-17 Hoechst Gosei Kk 低汚染型単層弾性塗料用エマルジョン
DE102005005205A1 (de) * 2005-02-03 2006-08-10 Basf Ag Verwendung einer wässrigen Polymerdispersion als Bindemittel für cellulosische Fasern sowie zur Herstellung von Filtermaterialien
JP5287555B2 (ja) * 2009-07-03 2013-09-11 東亞合成株式会社 エマルション組成物
JP6764665B2 (ja) * 2016-03-17 2020-10-07 東京応化工業株式会社 表面処理方法、帯電防止剤及び親水化処理剤

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414401A (en) * 1943-09-30 1947-01-14 Us Rubber Co Ternary acrylic ester, styrene, dienone interpolymer
US4403003A (en) * 1980-04-14 1983-09-06 Imperial Chemical Industries Limited Article having basecoat/clearcoat and process for coating

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414401A (en) * 1943-09-30 1947-01-14 Us Rubber Co Ternary acrylic ester, styrene, dienone interpolymer
US4403003A (en) * 1980-04-14 1983-09-06 Imperial Chemical Industries Limited Article having basecoat/clearcoat and process for coating

Also Published As

Publication number Publication date
EP0269059A2 (fr) 1988-06-01
ZA878802B (en) 1989-07-26
AU8322387A (en) 1988-06-16
KR890700144A (ko) 1989-03-10
BR8707541A (pt) 1989-02-21
EP0269059A3 (fr) 1988-08-03
JPH01501485A (ja) 1989-05-25

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